Methods for enhancing brightness and resistance to thermal yellowing of bleached kraft pulp and paper
US8246780B2 · kind B2 · utility
11Cited by
7References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2006 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Jul 13, 2026 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/1042
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Compositions and processes that preserve and enhance the brightness and improve color of pulp or paper when applied during different stages of the papermaking process are identified. The composition and method maintains and/or enhances brightness, prevent yellowing, and enhances the performance of paper products. Used in combination with optical brighteners and/or chelants the described agents produce a synergistic effect not previously identified in the paper process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.